Can you please! Please! Please helpppp me???????

The girl goes into her school at night by the way, not knight. I know you knew that though. It sounds good so far. Are you allowed to go supernatural with it? Vampire flicks are always popular. Or maybe the killer somehow finds his victims by calling their cellphone, and when they pause to answer it, brutally kills them. Power trip for him and all. Killer could be a man/woman/student of importance in the school as well. High school horror flicks are kind of fun too. You can lead the viewer into thinking it's one person and it turns out to be someone entirely different, like the cl president, quarterback or a teacher for example. There are so many ways you could go with it. I know I didn't help much, but I wish you luck anyway.